package com.demo.blog.utils;

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.JwtParser;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.io.Decoders;
import io.jsonwebtoken.security.Keys;
import lombok.extern.slf4j.Slf4j;

import java.security.Key;
import java.util.Date;
import java.util.Map;

/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: 22652
 * Date: 2024-07-24
 * Time: 14:00
 */
@Slf4j
public class JwtUtils {
    //过期时间: 1小时
    private static final long expiration = 10 * 60 * 1000;
    private static final String secretString = "qHt4kLJhJ3Zfvz/YTuPdfGezSNdMe0CL4d676BSKFx4=";
    private static final Key key = Keys.hmacShaKeyFor(Decoders.BASE64.decode(secretString));

    public static String genToken(Map<String, Object> claim) {
        String token = Jwts.builder()
                .setClaims(claim) //设置载荷信息
                .setExpiration(new Date(System.currentTimeMillis() + expiration)) //设置过期时间
                .signWith(key)  //设置签名
                .compact();
        return token;
    }

    public static Claims parseToken(String token) {
        if (token == null) {
            return null;
        }
        JwtParser build = Jwts.parserBuilder().setSigningKey(key).build();
        Claims claims = null;
        try {
            claims = build.parseClaimsJws(token).getBody();
        } catch (Exception e) {
            log.error("解析token失败, token:" + token);
        }
        return claims;
    }

    public static Integer getUserIdFromToken(String token) {
        Claims claims = parseToken(token);
        if (claims == null) {
            return null;
        }
        return (Integer) claims.get("id");
    }

}
